Manufacture of artificial silk



Patented May 12, 1936 UNITED STATES PATENT OFFICE MANUFACTURE OFARTIFICIAL SILK No Drawing. Application October 4, 1932, Serial No.636,180

4 Claims.

My present invention has to do with a new and novel method for producingartificial cellulosic products with a low lustre.

More especially, my present invention concerns 5 a new method forproducing artificial filaments which possess the desirable low lustre ofreal silk.

One object of the present invention is to provide a novel method forproducing a filament or thread of artificial silk which has greateropacity and covering power, and which possesses a low or dull lustre.

Other objects will become apparent from a study of the followingspecification and claims.

In the manufacture of artificial filaments, a cellulosic solution isprepared (cuprammonium, viscose, nitrocellulose or organic derivativesof cellulose), and spun or extruded into a medium which tends to hardenthe filaments thus formed. My present invention has to do with a new andnovel mixture or compound, to be added to the spinning solution beforethe filaments are formed, and which remains in the filaments during theafter treatment thereof. The presence of this substance in the filamentsgives them the greater opacity and covering power desired and rendersthem lustreless.

I prepare an emulsion which I add to the spinning solution prior to theextrusion of the filaments. This emulsion is thoroughly mixed with thesolution, and is composed of:

Casein One part Nitrocellulose-lacquer Two parts Of this emulsion Iprefer to add about 15% to the cuprammonium cellulose or viscosesolutions, said percentage being based upon the cellulose content ofsaid solutions.

Having now set forth my invention as required by the patent statutes,what I desire to claim is:

1. A cellulosic spinning solution for the manufacture of soft-lustreproducts comprising a substance selected from the group consisting ofviscose and cuprammonium cellulose together with casein and anitrocellulose lacquer.

2. A soft-lustre viscose filament containing a small amount of caseinand of a nitrocellulose lacquer.

3. A soft-lustre cuprammonium cellulose filament containing a smallamount of casein and of a nitrocellulose lacquer.

4. A cellulosic spinning solution for the manu facture of soft-lustreproducts comprising a substance selected from the group consisting ofviscose and cuprammonium cellulose together with about 15 per cent of anemulsion consisting of one part of casein and two parts of anitrocellulose lacquer, said percentage of emulsion being based upon thecellulose content of said substance.

GUSTAV HARDT.

